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Iron ore sintering method and quantitative characterization method of mineral phase contents

A quantitative characterization and mineral phase technology, applied in the field of metallurgy, can solve the problems of inability to accurately describe the quantitative relationship between sinter quality, inability to quantitatively describe the influence of sinter phase composition and microstructure, and inability to accurately quantitatively characterize sinter, etc. Achieve accurate test results, reduce experimental errors, and ensure the effect of accuracy

Inactive Publication Date: 2016-10-26
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter what method is used, it is impossible to accurately and quantitatively characterize the content of various phases in sinter, and it is also impossible to accurately explain the quantitative relationship between the change of sinter quality and the phase composition.
The existing patents also improve the quality of sintered ore by optimizing the sintering process, but the reason for the improvement in the quality of sintered ore is difficult to clarify, and the effect of adding water vapor on the phase composition of sintered minerals cannot be described quantitatively, so we can only rely on A large number of experiments to get the empirical value of the best steam injection amount
[0005] In summary, the currently used sintering methods cannot essentially explain the mechanism of the influence of various factors on the properties of sintered ore, and cannot quantitatively describe the influence of changes in various factors on the phase composition and microstructure of sintered ore.

Method used

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  • Iron ore sintering method and quantitative characterization method of mineral phase contents
  • Iron ore sintering method and quantitative characterization method of mineral phase contents
  • Iron ore sintering method and quantitative characterization method of mineral phase contents

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Experimental program
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Embodiment 1

[0021] This embodiment is based on the sinter composition of steel plant A, and the experimental steps are as follows:

[0022] (1) Using analytically pure grade drug Fe 2 o 3 , Fe 3 o 4 , CaO, SiO 2 , MgO and Al 2 o 3 , prepare the mixture, grind and mix it evenly with an agate mortar, press the powdered material into a cylindrical sample with a diameter of 8mm and a height of 5mm with a pressure molding machine, the composition is shown in Table 1:

[0023] Table 1 Composition of sinter samples, %

[0024]

[0025] (2) The equilibrium sintering experiment was carried out in a silicon-molybdenum rod resistance furnace, the sample was placed in an alumina crucible, and the crucible was placed on the alumina base in the furnace, and the sample was heated by a resistance furnace at 20 °C / min to 1340 °C , at the same time, control the partial pressure of oxygen to 5×10 -3 atm, and kept at this atmospheric temperature for 10h to allow the chemical reaction to reach equi...

Embodiment 2

[0036] This embodiment is based on the sinter composition of steel plant B, and the experimental steps are as follows:

[0037] (1) Using analytically pure grade drug Fe 2 o 3 , Fe 3 o 4 , CaO, SiO 2 , MgO, Al 2 o 3 and TiO 2 , prepare the mixture, grind and mix it with an agate mortar, and press the powdered material into a cylindrical sample with a diameter of 8 mm and a height of 5 mm with a pressure molding machine. The composition is shown in Table 3.

[0038] Table 3 Composition of sinter samples, %

[0039]

[0040] (2) The equilibrium sintering experiment was carried out in a silicon-molybdenum rod resistance furnace, the sample was placed in an alumina crucible, and the crucible was placed on the alumina base in the furnace, and the sample was heated by a resistance furnace at 20 °C / min to 1340 °C , at the same time, control the partial pressure of oxygen to 5×10 -3 atm, the rest is nitrogen, and kept at this atmospheric temperature for 10h to allow the ch...

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Abstract

The invention discloses an iron ore sintering method and a quantitative characterization method of mineral phase contents. By an iron ore equilibrium phase sintering technology, quantitative research on the phase composition of sintered ore is carried out so as to determine the optimum ratio of sintered ore and sintering parameter condition. In comparison with traditional sinter pot experiments and commercial tests, the equilibrium phase sintering technology is adopted in the invention so as to greatly reduce experimental errors. Equipment such as an XRD, a scanning electron microscope, a metallographic microscope and the like is applied for detection of sintered samples. Various detection results confirm one another to ensure phase judgment accuracy. Meanwhile, ImageJ software is used for quantitative calculation of mineral phase contents so as to obtain precise phase type and quantitative composition. Therefore, this method has the characteristic of accurate detection results. By the method, the influence of sintering raw material and condition change on sintered ore phase composition can be analyzed from the perspective of phases, and then changes of metallurgical properties of sintered ore is analyzed. The method is scientific and practical.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to the category of sintering, in particular to an iron ore sintering method and a quantitative characterization method for mineral phase content. Background technique [0002] Sinter is an important raw material for blast furnace ironmaking. According to statistics, sinter accounts for 70% of the blast furnace charge structure in the iron and steel industry. Sinter plays an irreplaceable role in the iron and steel smelting process. The composition of sintered materials and smelting process will have a great impact on the quality of sintered ore. Therefore, choosing a better ratio of raw materials and optimizing the smelting process have important practical significance for reducing the cost of sintering and improving the quality of sintering ore. [0003] The sintering process is a very complex physical and chemical process. There are many factors affecting the sintering process, a...

Claims

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Application Information

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IPC IPC(8): G01N23/20G01N23/22G01N21/84C22B1/16
CPCC22B1/16G01N21/84G01N23/20091G01N23/22
Inventor 任山赵齐刘清才胡广孔明孟飞李琳杨剑蒋历俊郭富强
Owner CHONGQING UNIV
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